2 * kobject.c - library routines for handling generic kernel objects
4 * Copyright (c) 2002-2003 Patrick Mochel <mochel@osdl.org>
5 * Copyright (c) 2006-2007 Greg Kroah-Hartman <greg@kroah.com>
6 * Copyright (c) 2006-2007 Novell Inc.
8 * This file is released under the GPLv2.
11 * Please see the file Documentation/kobject.txt for critical information
12 * about using the kobject interface.
15 #include <linux/kobject.h>
16 #include <linux/kobj_completion.h>
17 #include <linux/string.h>
18 #include <linux/export.h>
19 #include <linux/stat.h>
20 #include <linux/slab.h>
23 * kobject_namespace - return @kobj's namespace tag
24 * @kobj: kobject in question
26 * Returns namespace tag of @kobj if its parent has namespace ops enabled
27 * and thus @kobj should have a namespace tag associated with it. Returns
30 const void *kobject_namespace(struct kobject *kobj)
32 const struct kobj_ns_type_operations *ns_ops = kobj_ns_ops(kobj);
35 if (!ns_ops || ns_ops->type == KOBJ_NS_TYPE_NONE)
38 ns = kobj->ktype->namespace(kobj);
39 WARN_ON(!ns); /* @kobj in a namespace is required to have !NULL tag */
44 * populate_dir - populate directory with attributes.
45 * @kobj: object we're working on.
47 * Most subsystems have a set of default attributes that are associated
48 * with an object that registers with them. This is a helper called during
49 * object registration that loops through the default attributes of the
50 * subsystem and creates attributes files for them in sysfs.
52 static int populate_dir(struct kobject *kobj)
54 struct kobj_type *t = get_ktype(kobj);
55 struct attribute *attr;
59 if (t && t->default_attrs) {
60 for (i = 0; (attr = t->default_attrs[i]) != NULL; i++) {
61 error = sysfs_create_file(kobj, attr);
69 static int create_dir(struct kobject *kobj)
73 error = sysfs_create_dir_ns(kobj, kobject_namespace(kobj));
75 error = populate_dir(kobj);
77 sysfs_remove_dir(kobj);
81 * @kobj->sd may be deleted by an ancestor going away. Hold an
82 * extra reference so that it stays until @kobj is gone.
89 static int get_kobj_path_length(struct kobject *kobj)
92 struct kobject *parent = kobj;
94 /* walk up the ancestors until we hit the one pointing to the
96 * Add 1 to strlen for leading '/' of each level.
99 if (kobject_name(parent) == NULL)
101 length += strlen(kobject_name(parent)) + 1;
102 parent = parent->parent;
107 static void fill_kobj_path(struct kobject *kobj, char *path, int length)
109 struct kobject *parent;
112 for (parent = kobj; parent; parent = parent->parent) {
113 int cur = strlen(kobject_name(parent));
114 /* back up enough to print this name with '/' */
116 strncpy(path + length, kobject_name(parent), cur);
117 *(path + --length) = '/';
120 pr_debug("kobject: '%s' (%p): %s: path = '%s'\n", kobject_name(kobj),
121 kobj, __func__, path);
125 * kobject_get_path - generate and return the path associated with a given kobj and kset pair.
127 * @kobj: kobject in question, with which to build the path
128 * @gfp_mask: the allocation type used to allocate the path
130 * The result must be freed by the caller with kfree().
132 char *kobject_get_path(struct kobject *kobj, gfp_t gfp_mask)
137 len = get_kobj_path_length(kobj);
140 path = kzalloc(len, gfp_mask);
143 fill_kobj_path(kobj, path, len);
147 EXPORT_SYMBOL_GPL(kobject_get_path);
149 /* add the kobject to its kset's list */
150 static void kobj_kset_join(struct kobject *kobj)
155 kset_get(kobj->kset);
156 spin_lock(&kobj->kset->list_lock);
157 list_add_tail(&kobj->entry, &kobj->kset->list);
158 spin_unlock(&kobj->kset->list_lock);
161 /* remove the kobject from its kset's list */
162 static void kobj_kset_leave(struct kobject *kobj)
167 spin_lock(&kobj->kset->list_lock);
168 list_del_init(&kobj->entry);
169 spin_unlock(&kobj->kset->list_lock);
170 kset_put(kobj->kset);
173 static void kobject_init_internal(struct kobject *kobj)
177 kref_init(&kobj->kref);
178 INIT_LIST_HEAD(&kobj->entry);
179 kobj->state_in_sysfs = 0;
180 kobj->state_add_uevent_sent = 0;
181 kobj->state_remove_uevent_sent = 0;
182 kobj->state_initialized = 1;
186 static int kobject_add_internal(struct kobject *kobj)
189 struct kobject *parent;
194 if (!kobj->name || !kobj->name[0]) {
195 WARN(1, "kobject: (%p): attempted to be registered with empty "
200 parent = kobject_get(kobj->parent);
202 /* join kset if set, use it as parent if we do not already have one */
205 parent = kobject_get(&kobj->kset->kobj);
206 kobj_kset_join(kobj);
207 kobj->parent = parent;
210 pr_debug("kobject: '%s' (%p): %s: parent: '%s', set: '%s'\n",
211 kobject_name(kobj), kobj, __func__,
212 parent ? kobject_name(parent) : "<NULL>",
213 kobj->kset ? kobject_name(&kobj->kset->kobj) : "<NULL>");
215 error = create_dir(kobj);
217 kobj_kset_leave(kobj);
221 /* be noisy on error issues */
222 if (error == -EEXIST)
223 WARN(1, "%s failed for %s with "
224 "-EEXIST, don't try to register things with "
225 "the same name in the same directory.\n",
226 __func__, kobject_name(kobj));
228 WARN(1, "%s failed for %s (error: %d parent: %s)\n",
229 __func__, kobject_name(kobj), error,
230 parent ? kobject_name(parent) : "'none'");
232 kobj->state_in_sysfs = 1;
238 * kobject_set_name_vargs - Set the name of an kobject
239 * @kobj: struct kobject to set the name of
240 * @fmt: format string used to build the name
241 * @vargs: vargs to format the string.
243 int kobject_set_name_vargs(struct kobject *kobj, const char *fmt,
246 const char *old_name = kobj->name;
249 if (kobj->name && !fmt)
252 kobj->name = kvasprintf(GFP_KERNEL, fmt, vargs);
256 /* ewww... some of these buggers have '/' in the name ... */
257 while ((s = strchr(kobj->name, '/')))
265 * kobject_set_name - Set the name of a kobject
266 * @kobj: struct kobject to set the name of
267 * @fmt: format string used to build the name
269 * This sets the name of the kobject. If you have already added the
270 * kobject to the system, you must call kobject_rename() in order to
271 * change the name of the kobject.
273 int kobject_set_name(struct kobject *kobj, const char *fmt, ...)
278 va_start(vargs, fmt);
279 retval = kobject_set_name_vargs(kobj, fmt, vargs);
284 EXPORT_SYMBOL(kobject_set_name);
287 * kobject_init - initialize a kobject structure
288 * @kobj: pointer to the kobject to initialize
289 * @ktype: pointer to the ktype for this kobject.
291 * This function will properly initialize a kobject such that it can then
292 * be passed to the kobject_add() call.
294 * After this function is called, the kobject MUST be cleaned up by a call
295 * to kobject_put(), not by a call to kfree directly to ensure that all of
296 * the memory is cleaned up properly.
298 void kobject_init(struct kobject *kobj, struct kobj_type *ktype)
303 err_str = "invalid kobject pointer!";
307 err_str = "must have a ktype to be initialized properly!\n";
310 if (kobj->state_initialized) {
311 /* do not error out as sometimes we can recover */
312 printk(KERN_ERR "kobject (%p): tried to init an initialized "
313 "object, something is seriously wrong.\n", kobj);
317 kobject_init_internal(kobj);
322 printk(KERN_ERR "kobject (%p): %s\n", kobj, err_str);
325 EXPORT_SYMBOL(kobject_init);
327 static int kobject_add_varg(struct kobject *kobj, struct kobject *parent,
328 const char *fmt, va_list vargs)
332 retval = kobject_set_name_vargs(kobj, fmt, vargs);
334 printk(KERN_ERR "kobject: can not set name properly!\n");
337 kobj->parent = parent;
338 return kobject_add_internal(kobj);
342 * kobject_add - the main kobject add function
343 * @kobj: the kobject to add
344 * @parent: pointer to the parent of the kobject.
345 * @fmt: format to name the kobject with.
347 * The kobject name is set and added to the kobject hierarchy in this
350 * If @parent is set, then the parent of the @kobj will be set to it.
351 * If @parent is NULL, then the parent of the @kobj will be set to the
352 * kobject associted with the kset assigned to this kobject. If no kset
353 * is assigned to the kobject, then the kobject will be located in the
354 * root of the sysfs tree.
356 * If this function returns an error, kobject_put() must be called to
357 * properly clean up the memory associated with the object.
358 * Under no instance should the kobject that is passed to this function
359 * be directly freed with a call to kfree(), that can leak memory.
361 * Note, no "add" uevent will be created with this call, the caller should set
362 * up all of the necessary sysfs files for the object and then call
363 * kobject_uevent() with the UEVENT_ADD parameter to ensure that
364 * userspace is properly notified of this kobject's creation.
366 int kobject_add(struct kobject *kobj, struct kobject *parent,
367 const char *fmt, ...)
375 if (!kobj->state_initialized) {
376 printk(KERN_ERR "kobject '%s' (%p): tried to add an "
377 "uninitialized object, something is seriously wrong.\n",
378 kobject_name(kobj), kobj);
383 retval = kobject_add_varg(kobj, parent, fmt, args);
388 EXPORT_SYMBOL(kobject_add);
391 * kobject_init_and_add - initialize a kobject structure and add it to the kobject hierarchy
392 * @kobj: pointer to the kobject to initialize
393 * @ktype: pointer to the ktype for this kobject.
394 * @parent: pointer to the parent of this kobject.
395 * @fmt: the name of the kobject.
397 * This function combines the call to kobject_init() and
398 * kobject_add(). The same type of error handling after a call to
399 * kobject_add() and kobject lifetime rules are the same here.
401 int kobject_init_and_add(struct kobject *kobj, struct kobj_type *ktype,
402 struct kobject *parent, const char *fmt, ...)
407 kobject_init(kobj, ktype);
410 retval = kobject_add_varg(kobj, parent, fmt, args);
415 EXPORT_SYMBOL_GPL(kobject_init_and_add);
418 * kobject_rename - change the name of an object
419 * @kobj: object in question.
420 * @new_name: object's new name
422 * It is the responsibility of the caller to provide mutual
423 * exclusion between two different calls of kobject_rename
424 * on the same kobject and to ensure that new_name is valid and
425 * won't conflict with other kobjects.
427 int kobject_rename(struct kobject *kobj, const char *new_name)
430 const char *devpath = NULL;
431 const char *dup_name = NULL, *name;
432 char *devpath_string = NULL;
435 kobj = kobject_get(kobj);
441 devpath = kobject_get_path(kobj, GFP_KERNEL);
446 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
447 if (!devpath_string) {
451 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
452 envp[0] = devpath_string;
455 name = dup_name = kstrdup(new_name, GFP_KERNEL);
461 error = sysfs_rename_dir_ns(kobj, new_name, kobject_namespace(kobj));
465 /* Install the new kobject name */
466 dup_name = kobj->name;
469 /* This function is mostly/only used for network interface.
470 * Some hotplug package track interfaces by their name and
471 * therefore want to know when the name is changed by the user. */
472 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
476 kfree(devpath_string);
482 EXPORT_SYMBOL_GPL(kobject_rename);
485 * kobject_move - move object to another parent
486 * @kobj: object in question.
487 * @new_parent: object's new parent (can be NULL)
489 int kobject_move(struct kobject *kobj, struct kobject *new_parent)
492 struct kobject *old_parent;
493 const char *devpath = NULL;
494 char *devpath_string = NULL;
497 kobj = kobject_get(kobj);
500 new_parent = kobject_get(new_parent);
503 new_parent = kobject_get(&kobj->kset->kobj);
506 /* old object path */
507 devpath = kobject_get_path(kobj, GFP_KERNEL);
512 devpath_string = kmalloc(strlen(devpath) + 15, GFP_KERNEL);
513 if (!devpath_string) {
517 sprintf(devpath_string, "DEVPATH_OLD=%s", devpath);
518 envp[0] = devpath_string;
520 error = sysfs_move_dir_ns(kobj, new_parent, kobject_namespace(kobj));
523 old_parent = kobj->parent;
524 kobj->parent = new_parent;
526 kobject_put(old_parent);
527 kobject_uevent_env(kobj, KOBJ_MOVE, envp);
529 kobject_put(new_parent);
531 kfree(devpath_string);
537 * kobject_del - unlink kobject from hierarchy.
540 void kobject_del(struct kobject *kobj)
542 struct sysfs_dirent *sd;
548 sysfs_remove_dir(kobj);
551 kobj->state_in_sysfs = 0;
552 kobj_kset_leave(kobj);
553 kobject_put(kobj->parent);
558 * kobject_get - increment refcount for object.
561 struct kobject *kobject_get(struct kobject *kobj)
564 kref_get(&kobj->kref);
568 static struct kobject * __must_check kobject_get_unless_zero(struct kobject *kobj)
570 if (!kref_get_unless_zero(&kobj->kref))
576 * kobject_cleanup - free kobject resources.
577 * @kobj: object to cleanup
579 static void kobject_cleanup(struct kobject *kobj)
581 struct kobj_type *t = get_ktype(kobj);
582 const char *name = kobj->name;
584 pr_debug("kobject: '%s' (%p): %s, parent %p\n",
585 kobject_name(kobj), kobj, __func__, kobj->parent);
587 if (t && !t->release)
588 pr_debug("kobject: '%s' (%p): does not have a release() "
589 "function, it is broken and must be fixed.\n",
590 kobject_name(kobj), kobj);
592 /* send "remove" if the caller did not do it but sent "add" */
593 if (kobj->state_add_uevent_sent && !kobj->state_remove_uevent_sent) {
594 pr_debug("kobject: '%s' (%p): auto cleanup 'remove' event\n",
595 kobject_name(kobj), kobj);
596 kobject_uevent(kobj, KOBJ_REMOVE);
599 /* remove from sysfs if the caller did not do it */
600 if (kobj->state_in_sysfs) {
601 pr_debug("kobject: '%s' (%p): auto cleanup kobject_del\n",
602 kobject_name(kobj), kobj);
606 if (t && t->release) {
607 pr_debug("kobject: '%s' (%p): calling ktype release\n",
608 kobject_name(kobj), kobj);
612 /* free name if we allocated it */
614 pr_debug("kobject: '%s': free name\n", name);
619 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
620 static void kobject_delayed_cleanup(struct work_struct *work)
622 kobject_cleanup(container_of(to_delayed_work(work),
623 struct kobject, release));
627 static void kobject_release(struct kref *kref)
629 struct kobject *kobj = container_of(kref, struct kobject, kref);
630 #ifdef CONFIG_DEBUG_KOBJECT_RELEASE
631 pr_debug("kobject: '%s' (%p): %s, parent %p (delayed)\n",
632 kobject_name(kobj), kobj, __func__, kobj->parent);
633 INIT_DELAYED_WORK(&kobj->release, kobject_delayed_cleanup);
634 schedule_delayed_work(&kobj->release, HZ);
636 kobject_cleanup(kobj);
641 * kobject_put - decrement refcount for object.
644 * Decrement the refcount, and if 0, call kobject_cleanup().
646 void kobject_put(struct kobject *kobj)
649 if (!kobj->state_initialized)
650 WARN(1, KERN_WARNING "kobject: '%s' (%p): is not "
651 "initialized, yet kobject_put() is being "
652 "called.\n", kobject_name(kobj), kobj);
653 kref_put(&kobj->kref, kobject_release);
657 static void dynamic_kobj_release(struct kobject *kobj)
659 pr_debug("kobject: (%p): %s\n", kobj, __func__);
663 static struct kobj_type dynamic_kobj_ktype = {
664 .release = dynamic_kobj_release,
665 .sysfs_ops = &kobj_sysfs_ops,
669 * kobject_create - create a struct kobject dynamically
671 * This function creates a kobject structure dynamically and sets it up
672 * to be a "dynamic" kobject with a default release function set up.
674 * If the kobject was not able to be created, NULL will be returned.
675 * The kobject structure returned from here must be cleaned up with a
676 * call to kobject_put() and not kfree(), as kobject_init() has
677 * already been called on this structure.
679 struct kobject *kobject_create(void)
681 struct kobject *kobj;
683 kobj = kzalloc(sizeof(*kobj), GFP_KERNEL);
687 kobject_init(kobj, &dynamic_kobj_ktype);
692 * kobject_create_and_add - create a struct kobject dynamically and register it with sysfs
694 * @name: the name for the kobject
695 * @parent: the parent kobject of this kobject, if any.
697 * This function creates a kobject structure dynamically and registers it
698 * with sysfs. When you are finished with this structure, call
699 * kobject_put() and the structure will be dynamically freed when
700 * it is no longer being used.
702 * If the kobject was not able to be created, NULL will be returned.
704 struct kobject *kobject_create_and_add(const char *name, struct kobject *parent)
706 struct kobject *kobj;
709 kobj = kobject_create();
713 retval = kobject_add(kobj, parent, "%s", name);
715 printk(KERN_WARNING "%s: kobject_add error: %d\n",
722 EXPORT_SYMBOL_GPL(kobject_create_and_add);
725 * kset_init - initialize a kset for use
728 void kset_init(struct kset *k)
730 kobject_init_internal(&k->kobj);
731 INIT_LIST_HEAD(&k->list);
732 spin_lock_init(&k->list_lock);
735 /* default kobject attribute operations */
736 static ssize_t kobj_attr_show(struct kobject *kobj, struct attribute *attr,
739 struct kobj_attribute *kattr;
742 kattr = container_of(attr, struct kobj_attribute, attr);
744 ret = kattr->show(kobj, kattr, buf);
748 static ssize_t kobj_attr_store(struct kobject *kobj, struct attribute *attr,
749 const char *buf, size_t count)
751 struct kobj_attribute *kattr;
754 kattr = container_of(attr, struct kobj_attribute, attr);
756 ret = kattr->store(kobj, kattr, buf, count);
760 const struct sysfs_ops kobj_sysfs_ops = {
761 .show = kobj_attr_show,
762 .store = kobj_attr_store,
766 * kobj_completion_init - initialize a kobj_completion object.
767 * @kc: kobj_completion
768 * @ktype: type of kobject to initialize
770 * kobj_completion structures can be embedded within structures with different
771 * lifetime rules. During the release of the enclosing object, we can
772 * wait on the release of the kobject so that we don't free it while it's
775 void kobj_completion_init(struct kobj_completion *kc, struct kobj_type *ktype)
777 init_completion(&kc->kc_unregister);
778 kobject_init(&kc->kc_kobj, ktype);
780 EXPORT_SYMBOL_GPL(kobj_completion_init);
783 * kobj_completion_release - release a kobj_completion object
784 * @kobj: kobject embedded in kobj_completion
786 * Used with kobject_release to notify waiters that the kobject has been
789 void kobj_completion_release(struct kobject *kobj)
791 struct kobj_completion *kc = kobj_to_kobj_completion(kobj);
792 complete(&kc->kc_unregister);
794 EXPORT_SYMBOL_GPL(kobj_completion_release);
797 * kobj_completion_del_and_wait - release the kobject and wait for it
798 * @kc: kobj_completion object to release
800 * Delete the kobject from sysfs and drop the reference count. Then wait
801 * until any other outstanding references are also dropped. This routine
802 * is only necessary once other references may have been taken on the
803 * kobject. Typically this happens when the kobject has been published
804 * to sysfs via kobject_add.
806 void kobj_completion_del_and_wait(struct kobj_completion *kc)
808 kobject_del(&kc->kc_kobj);
809 kobject_put(&kc->kc_kobj);
810 wait_for_completion(&kc->kc_unregister);
812 EXPORT_SYMBOL_GPL(kobj_completion_del_and_wait);
815 * kset_register - initialize and add a kset.
818 int kset_register(struct kset *k)
826 err = kobject_add_internal(&k->kobj);
829 kobject_uevent(&k->kobj, KOBJ_ADD);
834 * kset_unregister - remove a kset.
837 void kset_unregister(struct kset *k)
841 kobject_put(&k->kobj);
845 * kset_find_obj - search for object in kset.
846 * @kset: kset we're looking in.
847 * @name: object's name.
849 * Lock kset via @kset->subsys, and iterate over @kset->list,
850 * looking for a matching kobject. If matching object is found
851 * take a reference and return the object.
853 struct kobject *kset_find_obj(struct kset *kset, const char *name)
856 struct kobject *ret = NULL;
858 spin_lock(&kset->list_lock);
860 list_for_each_entry(k, &kset->list, entry) {
861 if (kobject_name(k) && !strcmp(kobject_name(k), name)) {
862 ret = kobject_get_unless_zero(k);
867 spin_unlock(&kset->list_lock);
871 static void kset_release(struct kobject *kobj)
873 struct kset *kset = container_of(kobj, struct kset, kobj);
874 pr_debug("kobject: '%s' (%p): %s\n",
875 kobject_name(kobj), kobj, __func__);
879 static struct kobj_type kset_ktype = {
880 .sysfs_ops = &kobj_sysfs_ops,
881 .release = kset_release,
885 * kset_create - create a struct kset dynamically
887 * @name: the name for the kset
888 * @uevent_ops: a struct kset_uevent_ops for the kset
889 * @parent_kobj: the parent kobject of this kset, if any.
891 * This function creates a kset structure dynamically. This structure can
892 * then be registered with the system and show up in sysfs with a call to
893 * kset_register(). When you are finished with this structure, if
894 * kset_register() has been called, call kset_unregister() and the
895 * structure will be dynamically freed when it is no longer being used.
897 * If the kset was not able to be created, NULL will be returned.
899 static struct kset *kset_create(const char *name,
900 const struct kset_uevent_ops *uevent_ops,
901 struct kobject *parent_kobj)
906 kset = kzalloc(sizeof(*kset), GFP_KERNEL);
909 retval = kobject_set_name(&kset->kobj, "%s", name);
914 kset->uevent_ops = uevent_ops;
915 kset->kobj.parent = parent_kobj;
918 * The kobject of this kset will have a type of kset_ktype and belong to
919 * no kset itself. That way we can properly free it when it is
920 * finished being used.
922 kset->kobj.ktype = &kset_ktype;
923 kset->kobj.kset = NULL;
929 * kset_create_and_add - create a struct kset dynamically and add it to sysfs
931 * @name: the name for the kset
932 * @uevent_ops: a struct kset_uevent_ops for the kset
933 * @parent_kobj: the parent kobject of this kset, if any.
935 * This function creates a kset structure dynamically and registers it
936 * with sysfs. When you are finished with this structure, call
937 * kset_unregister() and the structure will be dynamically freed when it
938 * is no longer being used.
940 * If the kset was not able to be created, NULL will be returned.
942 struct kset *kset_create_and_add(const char *name,
943 const struct kset_uevent_ops *uevent_ops,
944 struct kobject *parent_kobj)
949 kset = kset_create(name, uevent_ops, parent_kobj);
952 error = kset_register(kset);
959 EXPORT_SYMBOL_GPL(kset_create_and_add);
962 static DEFINE_SPINLOCK(kobj_ns_type_lock);
963 static const struct kobj_ns_type_operations *kobj_ns_ops_tbl[KOBJ_NS_TYPES];
965 int kobj_ns_type_register(const struct kobj_ns_type_operations *ops)
967 enum kobj_ns_type type = ops->type;
970 spin_lock(&kobj_ns_type_lock);
973 if (type >= KOBJ_NS_TYPES)
977 if (type <= KOBJ_NS_TYPE_NONE)
981 if (kobj_ns_ops_tbl[type])
985 kobj_ns_ops_tbl[type] = ops;
988 spin_unlock(&kobj_ns_type_lock);
992 int kobj_ns_type_registered(enum kobj_ns_type type)
996 spin_lock(&kobj_ns_type_lock);
997 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES))
998 registered = kobj_ns_ops_tbl[type] != NULL;
999 spin_unlock(&kobj_ns_type_lock);
1004 const struct kobj_ns_type_operations *kobj_child_ns_ops(struct kobject *parent)
1006 const struct kobj_ns_type_operations *ops = NULL;
1008 if (parent && parent->ktype->child_ns_type)
1009 ops = parent->ktype->child_ns_type(parent);
1014 const struct kobj_ns_type_operations *kobj_ns_ops(struct kobject *kobj)
1016 return kobj_child_ns_ops(kobj->parent);
1019 bool kobj_ns_current_may_mount(enum kobj_ns_type type)
1021 bool may_mount = true;
1023 spin_lock(&kobj_ns_type_lock);
1024 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1025 kobj_ns_ops_tbl[type])
1026 may_mount = kobj_ns_ops_tbl[type]->current_may_mount();
1027 spin_unlock(&kobj_ns_type_lock);
1032 void *kobj_ns_grab_current(enum kobj_ns_type type)
1036 spin_lock(&kobj_ns_type_lock);
1037 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1038 kobj_ns_ops_tbl[type])
1039 ns = kobj_ns_ops_tbl[type]->grab_current_ns();
1040 spin_unlock(&kobj_ns_type_lock);
1045 const void *kobj_ns_netlink(enum kobj_ns_type type, struct sock *sk)
1047 const void *ns = NULL;
1049 spin_lock(&kobj_ns_type_lock);
1050 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1051 kobj_ns_ops_tbl[type])
1052 ns = kobj_ns_ops_tbl[type]->netlink_ns(sk);
1053 spin_unlock(&kobj_ns_type_lock);
1058 const void *kobj_ns_initial(enum kobj_ns_type type)
1060 const void *ns = NULL;
1062 spin_lock(&kobj_ns_type_lock);
1063 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1064 kobj_ns_ops_tbl[type])
1065 ns = kobj_ns_ops_tbl[type]->initial_ns();
1066 spin_unlock(&kobj_ns_type_lock);
1071 void kobj_ns_drop(enum kobj_ns_type type, void *ns)
1073 spin_lock(&kobj_ns_type_lock);
1074 if ((type > KOBJ_NS_TYPE_NONE) && (type < KOBJ_NS_TYPES) &&
1075 kobj_ns_ops_tbl[type] && kobj_ns_ops_tbl[type]->drop_ns)
1076 kobj_ns_ops_tbl[type]->drop_ns(ns);
1077 spin_unlock(&kobj_ns_type_lock);
1080 EXPORT_SYMBOL(kobject_get);
1081 EXPORT_SYMBOL(kobject_put);
1082 EXPORT_SYMBOL(kobject_del);
1084 EXPORT_SYMBOL(kset_register);
1085 EXPORT_SYMBOL(kset_unregister);